From: Paul Eggert Date: Tue, 24 Feb 1998 23:17:38 +0000 (+0000) Subject: Initial revision X-Git-Url: https://git.brokenzipper.com/gitweb?a=commitdiff_plain;h=2c3536c509184317c28a9e25a729007b05508d03;p=chaz%2Ftar Initial revision --- diff --git a/lib/full-write.c b/lib/full-write.c new file mode 100644 index 0000000..ac27d62 --- /dev/null +++ b/lib/full-write.c @@ -0,0 +1,65 @@ +/* full-write.c -- an interface to write that retries after interrupts + Copyright (C) 1993, 1994, 1997, 1998 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Copied largely from GNU C's cccp.c. + */ + +#if HAVE_CONFIG_H +# include +#endif + +#include + +#if HAVE_UNISTD_H +# include +#endif + +#include +#ifndef errno +extern int errno; +#endif + +/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted. + Return LEN upon success, write's (negative) error code otherwise. */ + +int +full_write (int desc, const char *ptr, size_t len) +{ + int total_written; + + total_written = 0; + while (len > 0) + { + int written = write (desc, ptr, len); + /* FIXME: write on my slackware Linux 1.2.13 returns zero when + I try to write more data than there is room on a floppy disk. + This puts dd into an infinite loop. Reproduce with + dd if=/dev/zero of=/dev/fd0. */ + if (written < 0) + { +#ifdef EINTR + if (errno == EINTR) + continue; +#endif + return written; + } + total_written += written; + ptr += written; + len -= written; + } + return total_written; +}